I've seen folks post their room dimensions and layout here to get feedback on bass trap placement. Hope it's OK for me to do the same. I had to include my layout as an attachment to this post since I'm not sure how to get it into the body of the post.

Basically my studio is 11.5 by 12.5 feet with a height of 12.5 feet. I can't afford to have bass traps in all eight corners. I'm thinking maybe the 4 floor corners. I have an e-drum set in the room and a mic stand facing a carpeted corner (the mic stand is a portable "booth" attached to it. The sound works well for me I find. But maybe I'm just not aware enough of bass problems with it since it faces a corner.

There are three doors in the room, one of which is always closed. The other two are covered by sound-absorbing curtains and closed of course when I'm working. The windows face another room so are not open to the street. Sound proofing is OK enough for me. The issue is room treatment for mixing.

I'll run a diagnostic but would love to hear feedback from folks who are more experienced with this kind of thing. I've never tried to treat a room before.